The story with Intel is they will do their own thing, and can stay independent of HMC. Check out the latest word out on Haswell's L4 cache - it's actually DRAM made by Intel itself (on its 22 nm trigate process).
I don't think HMC benefits or benefits from NV since larger latency and less frequent access may be expected. But if there is a new type of memory that is very much like DRAM working memory (maybe STT?) perhaps it could be considered as well.